If after the end of the clone phase, we have on the syncing node

collection_a: UUID_1
collection_b: UUID_2
collection_c: UUID_3

and we replay a renameCollection opcode renaming UUID_1 to collection_b with dropTarget: UUID_3, we will correctly rename UUID_2 to a temporary name, but also incorrectly drop UUID_3. When we then go to create UUID_3 in a later oplog entry, it may be in drop_pending state and refuse to be re-created.